The new signs, which urge people to slow down, turn down their headphones and keep track of their dogs, are posted along the trail and painted on the pavement.
With lights on his helmet and bike, David Gordon is among the safest cyclists in the city. But during his daily bicycle commute to work, he's seen plenty of riders who jeopardize the safety of others.
"I usually go between 8 and 10 miles per hour," he said. "I've seen some at 25 miles per hour."
Liz Johnson said it's common to see bike riders taking corners way too fast on the Burke-Gilman Trail. That's part of the reason she's helping out with the new safety campaign.
"Even at points where there was really high traffic, people were not slowing down. I couldn't believe it," she said.
The Cascade Bicycle Club is launching a pilot program this week asking everyone who uses the trail to look out for each other. The goal is to cut down on conflicts and crashes.
The bike club is doing outreach on the trail near the University of Washington on Thursday and plans to do more throughout the summer.